I have a channel of thousands of IDs that need to be processed in parallel inside goroutines. How could I implement a lock so that goroutines cannot process the same id at the same time, should it be repeated in the channel?
package main
import (
"fmt"
"sync"
"strconv"
"time"
)
var wg sync.WaitGroup
func main() {
var data []string
for d := 0; d < 30; d++ {
data = append(data, "id1")
data = append(data, "id2")
data = append(data, "id3")
}
chanData := createChan(data)
for i := 0; i < 10; i++ {
wg.Add(1)
process(chanData, i)
}
wg.Wait()
}
func createChan(data []string) <-chan string {
var out = make(chan string)
go func() {
for _, val := range data {
out <- val
}
close(out)
}()
return out
}
func process(ids <-chan string, i int) {
go func() {
defer wg.Done()
for id := range ids {
fmt.Println(id + " (goroutine " + strconv.Itoa(i) + ")")
time.Sleep(1 * time.Second)
}
}()
}
--edit: All values need to be processed in any order, but "id1, "id2" & "id3" need to block so they cannot be processed by more than one goroutine at the same time.